CO / Heat for hardwired sensors

I have hardwired CO and Heat sensors that I would like to use with my GC3 system. For Smoke I am using 2GIG-SDS1-345 which works good but I don’t see any similar products for CO and Heat. Can I use an additional 2GIG-SDS1-345 for that as well?

Additionally I read that 2GIG does not want you to use the wired terminals for hardwired smoke/co but I don’t understand why? Does anyone know? Would like to hardwire if possible.

The GC3 inputs are not listed for fire detection life safety devices. They are not rated or intended for such use.

For Smoke I am using 2GIG-SDS1-345 which works good but I don’t see any similar products for CO and Heat. Can I use an additional 2GIG-SDS1-345 for that as well?

No. Although an option does exist to monitor wired fire and co combo units: the FF345 firefighter. As long as the fire/co combo units are interconnected, you would only need one firefighter to monitor them.